The study investigated parental attachment styles as correlate of school adjustment of primary school pupils in Rivers state. The objective of the study was to find out the extent to which attachment styles (secure, ambivalent and avoidant) correlate independently and collectively with school adjustment. The population of the study was all the 8,086 pupils in all the 152 public primary schools in Ikwerre, Obio-Akpor and Port-Harcourt local government areas of Rivers state. A sample of 485 pupils from 30 public primary schools was drawn using simple random sampling and proportionate sampling technique. Four research questions and four null hypotheses guided the study. Two instruments were adapted for the study namely; Adjustment Inventory for School Student and Attachment Style Questionnaire. Face, content and construct validity of the instruments were ensured. Reliability of the instruments was done using test-retest method and the coefficients obtained are: .863 for school adjustment and .861, .752, and .917 for secure, ambivalent and avoidant attachment styles respectively. Simple regression analysis was used to answer research questions 1, 2 and 3 while multiple regression analysis was used to answer research question 4. In testing the null hypotheses, t-test associated with simple regression was used to test hypotheses 1,2 and 3 while hypotheses 4 was tested using Analysis of Variance associated with multiple regression. Results of the study indicated that secure attachment style and ambivalent attachment style had a negative and significant relationship with school adjustment while avoidant attachment style had a positive and no significant relationship with school adjustment. The result also revealed that there is a joint positive and significant relationship between the three attachment styles and school adjustment, Based on the findings, recommendations were made, one of which is that parents should create an enabling home environment that will help boost th